Improvement in hub-boring machines



ttt-et @man .thread on one side,

A. R. SILVER, OF SALEM, OHIO, ASSIGNOR TO HIMSELF ANlD JOHN DEMING, OF SAME PLACE.

Letters Patent No. 80,837, ilcterflrifltgust 1 1, 1868;A antetlcted July 25, 1868.

To all whom it mag/concern Be it known that I, A. R. SILVER, of Salem, in the county of Columbiana, and State of Ohio, have invented a new and improved Hub-Boring Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is an elevation of one side ofthe machine, with the upper portion of the mandrel broken away.

Figure 2 is atop view of the machine, with the handle of the mandrel removed.

Figure 3 is a diainetncal section through the machine. v

Figure 4 is a bottom view;

Figures 5 and 6 are enlarged views, showing the construction ofthe expansible feed-nut and its box.

Similar letters of reference indicate corresponding parts in the several figures. l This invention relates to certain novel improvements on machines which are designed mfor boring hubs true, and producing well-dencd shoulders Vin them for receiving axle-boxes.

The invention provides a self-centring chuck, having adjustable jaws, all of which are adapted for being adjusted simultaneously toward and from a common centre, for the purpose of rigidly griping and holding a hub in proper position, with respect to the axis of the mandrel carrying the boring-bit, for being bored and shouldered, as will be hereafterexplained.

The invention further provides for readily withdraw,V

ing'the mandrel, which carries the boring-tool, from the hubs after the operations of boring and shouldering have been completed; also, for preventing a progressive movement of the mandrel during the formation of the shoulders in the hubs, by the employment of an expansible feed-nut, which is' made in two sections', and tted to slide in dovetail ways formed in a cylindrical box, arranged upon the upper end of the tool-stock, said box being applied to the tool-stock, so that it can be fxedwhile a hubV is being bored', a1:l'd allowed'to turn withthe mandrel during the act of forming a shoulder in the hub, as will be hereinafter explained. v

The invention further provides an adjustable gauge, which is adapted forbeing secured fast tothe screwcut portion of the mandrel, atany desired point thereon, according to the depth which it is desired to bore into a hub; said gauge being so constructed, with a and an adjuatablegib on the op-' posite side, that the gauge can be adjusted upon its mandrel without turning or screwing, as will be hereinafter explained.

`To enable others skilled in the art to understand my invention,I will describe its construction and operation.

In the accompanying drawings,- F represents the 4screws H has its beaiings in a stirrup, n,

above the collar of the spur-wheel chuck-frame, which consists of three radiating arms, I

- jects above the upper surface of each chuck-arm, and

is screw-tapped for receiving through it an adjustingscrew, H', carrying on its inner end a small bevel-spur wheel,- H, and having its outer end squaredfor receiving a wrench. The inner portion of each one of the which keeps each screw steady and-in place.

4Rising from the centre of the chuck-frame Fis a` cylindrical hollow stem, F', around the Vlower portion of which is placed loosely a bevel-spur wheel, G, vthe teeth-of which engage with the three pinion-wheels H.

This spur-wheel Gr` is designed for causing the three griping-jaws J J J to move simultaneously, and pre-V serve theirconcentric.positions while being adjusted. Thus it will be seen that, by applying a wrench to one of the screws H, and turning it, the other two screws will also be turned in like manner.

That portion of the hollow stem F"which projects G, has a screwthread ycut upon it, and receives a hollow stock, E, in the upper end .of which an annular chamber is formed for the Vreception of the cylindrical neck of a box, D. When the stockE is screwed down' tightly, it prevents Vthe spur-wheelGfrom rising and becoming disengaged from theteeth ofthe pinions H.

The circular box D is applied to a circular bed-piece, g', having'a dovetail groove Ymade diametrically across its upper surface, into-which groove dovetail tenons, whichl are formed upon two half nuts, h la, are fitted to slide, as shown in gs. 3, 5and 6.

The half nuts are arranged on each' side of the axis of the box or mandrel A, studs, t t, which project from the upper sides of these nut-sections and enter segmental slots, s s, which are made through the top plateor cap of the box D, eccentrically to its axis, as shown in figs. 3, 5, and 6.

The grooved bed-plate gis tted into the lower end of the cap D, so as to allow this ca p to turn freely, and said 'plate g is attached to said cap by means of pins, t t', entering grooves in the periphery of plate g', as shown in iig. 3. A

When the cylindrical neck g is introduced into the upper chambered end of the tubular stock E, and conned rigidly in place to this stock, by the set-screw e',

the point of which enters an annular groove made in as shown in g. 3, and the i said cylindrical portion g,

and are moved by means of,l

. engage l vto allow the free escape of chips,

cap D is turned in one direction, the half nuts h h, will be caused to approach the axis of the mandrel A, and

with the screw-thread which is upon this mandrel, and when the cap D is turned in an opposite direction, the half nuts h 7L will be separated and disengaged from the thread on the mandrel.

Theannular groove e, in the cylindrical neck g, will allow this neck to be loosened, so that it will turn without'allowing it to be withdrawn from the stock E.

The mandrel A, which passes through the several parts, as shown in g. 3, is provided with a T-handle, B, upon its upper end, secured4 to it' by a screw, b, between which handle andthe cap D of the feed-nut is a gauge, C, which consists of a circular plate, having an oblong hole, d, through it, and a cham-bored projection, c2, on its periphery.

Onone side ofthe opening l threads are cut, adapted forreceiving the screw-threaded ,portion of the mandrel, and diametrically opposite the threads, `on the a gib, c, is fitted into the chambered por- Ition C2, so as to slide freely. l On the inner end of the gib c is a thread to correspond with that on the mandrel, and at the opposite or outer end of the gib a gauge-plate,

set-screw, c', is applied, which, being tightened, will securely clamp the gauge to the mandrel, so as to prevent thegauge from slipping up or down, or turning around the mandrel.

When the position of the gauge-plate C is to be changed, the set-screw c is turned so as to loosen it,

and the side of the gauge-plate, through which thev said. screw passes, is pressed against the mandrel, thus forcing the movable gib back into its chamber, and releasing the gauge-plate, when it is4 free to slide up or down on the mandrel.

The lower extremity of the mandrel A has a mortisemade diametrically through it, through which the bit a'pa'sses, and in which this bit is secured by a setscrew, a', that is tapped into the end of the` mandrel, as shown in iig. 3.

That portion of the llower end of themandrel A,

A which I have lettered b, is smaller in diameter than of the mandrel, and is made so as while boring, to pre.- vent choking, and also to allow a smaller hole to be bored than could be made' if the mandrel were of the same diameter throughout its length.

the upper portion I make a concave depression, bf, in the reduced portion l) of the mandrel A, just behind the cutter or bit, so as toform a space of sufficient capacity to receive the chips as fast as they are produced, and allow them to escape freely from the cutting-edge of thebit when a very small hole is to be bored.

When a hub is to be bored, the gauge-.plate C is secured on the mandrel at the proper distance fromthe cap D of the feed-nut to bore the required depth of hole in the hub. The hub being secured between the three jaws J, as above described, the mandrel is turned with a progressive `or feeding-movement, until the gauge-plate O cornes i'n contact with the cap D; the set-screw e is then loosened, permitting the feed-nut and its bore or cap to turn with the mandrel. The feed being thus stopped, a few turns of the mandrel form a perfectly square shoulder. ished, the cap D is turned to the left, thereby. separating the two sections of the feed-nut, and releasing the mandrel, when it can be ,withdrawn from the hub instantly, and again secured in the nut by turning the cap toward the right hand.

Having described my invention,

-What I claim as new, and desire to secure by Letters Patent, isy

l. The combination of the radially-,grooved chuckplate, sliding griping-j aws J, adjusting screws H', pinions H, and centre spur-wheel G, substantially in the manner and for the purpose described. y 2. The sections h hof the feed-nut, fitted in slotted bed g', applied to a turning-box or cap D, and con-l str ucted with a neck, g, substantially as described.

3. The combination of the expansible nut 7t bed g', neck e, set-screw c', and stock E, substantially as described. y

4. The construction of the gauge-plate Q, with an oblong opening, (l, through it, one side of which is` screw-cut to fit the mandrel, and the other side is provided with an .adjustable screw-cut gib, C, and `a setscrew, c', substantially in the manner and for the purposes described.

A. R.' SILVER.

Witnesses N. B. WATSON, E. W. FAwonr'r.

The shoulder being fin- 

